youre on 6.6 yes? im pretty sure ive fixed the issues with the kuro mobs already.
i assume you mean the battle images when you say covers, i dont think anything should ever outright erase the main characters image, just replace it. ill put out a change with the next patch that might fix it if there is an issue. the mimic, cube, and boss statuses are removed after battle also already so those shouldnt be a problem in the next fight.
the change might fix the kuro boss renas attacks, had a lot of problems with her for seemingly no reason that i was sure i fixed, so if it persists after the next patch i dont know whats wrong.
Teammates are turned when fully corrupted because its thematic and adds to the danger and sexiness of a fight, they dont have to be knocked out, just corrupted enough to turn on you. it makes you pay attention to them more and plan a bit, even if you dont its hard to not have extra renas in your inventory to replace them.
Im trying not to make it too hard, having teammates fight with you that lose their turns half the time is frustrating and only allows more time for the main rena to be taken out which is where the real threat lies. The others are expendable and weak, hence why they get replaced so easily.
removing the branch statuses keeps things from breaking, all enemies can inflict the original status but only specific enemies can inflict their specific branching statuses. If i allow the statuses to persist and you fight another enemy that inflicts a branch status then its going to conflict.
and the heal effect is a skill specifically tied to clones found without a wall in their troop, no other enemies can use it